# Delete files after they are successfully read delete-after-read yes
Major providers look unfavorably on unencrypted email. Setting use-starttls yes tells PowerMTA to encrypt the transmission if the receiving server supports it. Setting require-starttls no ensures that if a minor ISP lacks TLS capability, the email is still delivered in cleartext rather than being dropped entirely. 4. Automatic Backoff Processing sample powermta configuration file hot
FBLs are mandatory for sending to Yahoo, AOL, and Microsoft. The sample includes feedback-loop . Ensure fbl-handler.php unsubscribes complainants immediately. # Delete files after they are successfully read
: Restricts PowerMTA to 5 parallel connections. This prevents the Microsoft firewall from flagging your traffic as a Denial of Service (DoS) or a dictionary attack. Ensure fbl-handler
PowerMTA (Message Transfer Agent) is the industry standard for high-volume senders. Below is a tailored specifically for the high-engagement, high-expectation verticals of Lifestyle, Travel, Fashion, and Digital Entertainment.
processes 8 # One per CPU core max-smtp-out 2000 # Total outgoing connections max-errors-per-domain 20 max-errors-per-ip 10 max-no-answer 10 max-unknown-domain 5 max-per-host-out 100 # High concurrency per ISP max-per-ip-out 240 # Aggressive IP usage queue-retry-period 600 max-queue-size 5M max-retries 48 max-retry-interval 14400 # 4 hours max retry retry-interval 900 # Start retry after 15 min vmta-expansion true vmta-pool-expansion true
# ------------------------------------------------------------ # PowerMTA Hot Configuration File v4.5+ # Optimized for: 500k - 2M emails/hour # Key features: Multi-IP warmup, ISP throttling, DKIM, Feedback Loop # ------------------------------------------------------------